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Building the Glenn Canyon dam on the Colorado river caused [#permalink]
02 Aug 2008, 10:03

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Building the Glenn Canyon dam on the Colorado river caused unforeseenenvironmental effects. One of these is that, by preventing annualfloods, the dam prevents the river from stirring up sedimentscollected on the river bottom and depositing them high on the banks ofthe river. The deposited sediments are needed to create and maintainsandbars, which form natural habitats for native fish. By releasingwater from the dam annually, we will flood the river and thus recreatethe sandbars normally found below the dam."Which of the following must be true if the prediction of the landmanagement specialist above is also to prove true?1. There are no other effects of the dam which will prevent the nativefish of the river from using the new sandbars below the dam.2. The flood caused by massively releasing water from the dam will belike a natural flood in every major respect.3. The size of a sandbar on a river always stays the same or increasesafter a flood.4. Any other dams upriver from the Glen Canyon dam must also releaseenough water to cause a flood in order for the flood from the GlenCanyon dam to be successful.5. The dam does not prevent the flow of sediments from upriver neededto replenish the sediments that inevitably wash downstream over time.

Building the Glenn Canyon dam on the Colorado river caused unforeseenenvironmental effects. One of these is that, by preventing annualfloods, the dam prevents the river from stirring up sedimentscollected on the river bottom and depositing them high on the banks ofthe river. The deposited sediments are needed to create and maintainsandbars, which form natural habitats for native fish. By releasingwater from the dam annually, we will flood the river and thus recreatethe sandbars normally found below the dam."Which of the following must be true if the prediction of the landmanagement specialist above is also to prove true?

1. There are no other effects of the dam which will prevent the native fish of the river from using the new sandbars below the dam. -> this must be true in order to work out the solution provided in the argument as well as prediction to b true IMO (1)2. The flood caused by massively releasing water from the dam will be like a natural flood in every major respect. -> this is OOS since we are not concerned with quality of flood here 3. The size of a sandbar on a river always stays the same or increases after a flood. -> irrelevant how does size of sandbars affect native fish ?4. Any other dams upriver from the Glen Canyon dam must also release enough water to cause a flood in order for the flood from the Glen Canyon dam to be successful. -> this is irrelevant 5. The dam does not prevent the flow of sediments from upriver needed to replenish the sediments that inevitably wash downstream over time. -> weakens the argument

Building the Glenn Canyon dam on the Colorado river caused unforeseenenvironmental effects. One of these is that, by preventing annualfloods, the dam prevents the river from stirring up sedimentscollected on the river bottom and depositing them high on the banks ofthe river. The deposited sediments are needed to create and maintainsandbars, which form natural habitats for native fish. By releasingwater from the dam annually, we will flood the river and thus recreatethe sandbars normally found below the dam."Which of the following must be true if the prediction of the landmanagement specialist above is also to prove true?

1. There are no other effects of the dam which will prevent the native fish of the river from using the new sandbars below the dam. -> this must be true in order to work out the solution provided in the argument as well as prediction to b true IMO (1)2. The flood caused by massively releasing water from the dam will be like a natural flood in every major respect. -> this is OOS since we are not concerned with quality of flood here 3. The size of a sandbar on a river always stays the same or increases after a flood. -> irrelevant how does size of sandbars affect native fish ?4. Any other dams upriver from the Glen Canyon dam must also release enough water to cause a flood in order for the flood from the Glen Canyon dam to be successful. -> this is irrelevant 5. The dam does not prevent the flow of sediments from upriver needed to replenish the sediments that inevitably wash downstream over time. -> weakens the argument

1. There are no other effects of the dam which will prevent the nativefish of the river from using the new sandbars below the dam.--this could be an assumption but can’t be inferred2. The flood caused by massively releasing water from the dam will belike a natural flood in every major respect.--if water from dam can help recreate the sand bars, flood will also be same as natural flood 3. The size of a sandbar on a river always stays the same or increasesafter a flood.-- size of sandbar is not in discussion4. Any other dams upriver from the Glen Canyon dam must also releaseenough water to cause a flood in order for the flood from the GlenCanyon dam to be successful.--Other dams are not concerned5. The dam does not prevent the flow of sediments from upriver neededto replenish the sediments that inevitably wash downstream over time.-- May be true but no information from passage. _________________

1. There are no other effects of the dam which will prevent the nativefish of the river from using the new sandbars below the dam.--this could be an assumption but can’t be inferred2. The flood caused by massively releasing water from the dam will belike a natural flood in every major respect.--if water from dam can help recreate the sand bars, flood will also be same as natural flood 3. The size of a sandbar on a river always stays the same or increasesafter a flood.-- size of sandbar is not in discussion4. Any other dams upriver from the Glen Canyon dam must also releaseenough water to cause a flood in order for the flood from the GlenCanyon dam to be successful.--Other dams are not concerned5. The dam does not prevent the flow of sediments from upriver neededto replenish the sediments that inevitably wash downstream over time.-- May be true but no information from passage.

Yes true here the question is if X is true then Y must be true and we are looking for Y.I took the question vice versa and started looking for cause(X) instead of effect (Y) _________________

1. There are no other effects of the dam which will prevent the nativefish of the river from using the new sandbars below the dam.--this could be an assumption but can’t be inferred2. The flood caused by massively releasing water from the dam will belike a natural flood in every major respect.--if water from dam can help recreate the sand bars, flood will also be same as natural flood 3. The size of a sandbar on a river always stays the same or increasesafter a flood.-- size of sandbar is not in discussion4. Any other dams upriver from the Glen Canyon dam must also releaseenough water to cause a flood in order for the flood from the GlenCanyon dam to be successful.--Other dams are not concerned5. The dam does not prevent the flow of sediments from upriver neededto replenish the sediments that inevitably wash downstream over time.-- May be true but no information from passage.